1.6.1 Installing the CPU Asus prime Asus M3A78-EM

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Chapter 1: Product introduction


Central Processing Unit (CPU)

The motherboard comes with an AM2+ / AM2 socket designed for AMD® 

Phenom™ FX / Phenom / Athlon™ / Sempron™ processor.

The AM2+/AM2 socket has a different pinout from the 940-pin socket designed 

for the AMD Opteron processor. Ensure you use a CPU designed for the 

AM2+/AM2 socket. The CPU fits in only one correct orientation. DO NOT force 

the CPU into the socket to prevent bending the connectors on the socket and 

damaging the CPU!



To install a CPU.

1.  Locate the CPU socket on the motherboard.

2.  Unlock the socket by pressing the 

lever sideways, then lift it up to a 

90°-100° angle.

Ensure that the socket lever is lifted up to 90°-100° angle, otherwise the CPU 

does not fit in completely.


M3A78-EM CPU Socket AM2+